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Magnetic Circuits and Transformers

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Questions and Answers

What is the unit of magnetic flux?

Henry

Ampere

Tesla

Weber (correct)

What is the direction of magnetic field determined by?

Fleming's Rule

Left Hand Rule

Curl Rule

Right Hand Rule (correct)

What is the magnetic field intensity (H) proportional to?

Length of the magnetic path

Number of turns and current (correct)

Magnetomotive force

Area of the magnetic field

What is the line integral of the magnetic field intensity (H) around a closed path equal to?

Current enclosed Signup and view all the answers

What is the relation between mmf and magnetic field intensity (H)?

mmf = N i / l Signup and view all the answers

What is the relation between the magnetic field intensity H and the magnetic flux density B?

B = μH Signup and view all the answers

What is the unit of magnetic flux density?

Tesla Signup and view all the answers

What is the purpose of the magneto-motive force F?

To set up the magnetic flux lines within the magnetic material Signup and view all the answers

What is the relation between the reluctance ℜ and the permeability μ?

ℜ = l/μA Signup and view all the answers

What is the effect of saturation on the magnetic material?

The change of B is non-linear at higher values of H Signup and view all the answers

What is the purpose of the magnetization curve?

To show the relation between the magnetic field intensity and the flux density Signup and view all the answers

What are the two kinds of power losses that occur in a magnetic material during cyclic magnetization?

Hysteresis loss and eddy current loss Signup and view all the answers

What is the unit of the magneto-motive force F?

Ampere-turn Signup and view all the answers

What is the relation between the magnetic flux Φ and the magnetic flux density B?

Φ = BA Signup and view all the answers

What is the purpose of the reluctance ℜ in a magnetic circuit?

To oppose the magnetic flux Signup and view all the answers